Low-directivity quasi-monochromatic thermal radiation from microcavities covered by thin metal film

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Here, closed-end microcavity is proposed in which a semi-transparent metal film was formed atop microcavity. The structure shows weak angular dependence as well as quasimonochromatic absorptance. Au is employed as material of the cavity walls and the covering thin film. Quasi-monochromatic absorption from the structure is observed in numerical simulation. High quality factor (Q factor) is obtained by strong confinement in the closed-end microcavity. Asymmetric and quasi-monochromatic absorption band with a Q factor of ∼28 at 1.85 μm was observed. This value was about 4-fold larger than that of the open-end microcavity. Additionally, the closed-end microcavity structure filled with SiO2 in cavity exhibits isotropic and quasi-monochromatic thermal radiation over a wide solid angle. This result suggests that both quasimonochromatic and low-directivity absorptance can be realized by using this configuration.

Original languageEnglish
Title of host publicationMicro/Nanofluidics and Lab-on-a-Chip; Nanofluids; Micro/Nanoscale Interfacial Transport Phenomena; Micro/Nanoscale Boiling and Condensation Heat Transfer; Micro/Nanoscale Thermal Radiation; Micro/Nanoscale Energy Devices and Systems
PublisherAmerican Society of Mechanical Engineers
ISBN (Electronic)9780791849651
DOIs
Publication statusPublished - 2016 Jan 1
EventASME 2016 5th International Conference on Micro/Nanoscale Heat and Mass Transfer, MNHMT 2016 - Biopolis, Singapore
Duration: 2016 Jan 42016 Jan 6

Publication series

NameASME 2016 5th International Conference on Micro/Nanoscale Heat and Mass Transfer, MNHMT 2016
Volume1

Other

OtherASME 2016 5th International Conference on Micro/Nanoscale Heat and Mass Transfer, MNHMT 2016
CountrySingapore
CityBiopolis
Period16/1/416/1/6

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes

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    Kohiyama, A., Shimizu, M., Iguchi, F., & Yugami, H. (2016). Low-directivity quasi-monochromatic thermal radiation from microcavities covered by thin metal film. In Micro/Nanofluidics and Lab-on-a-Chip; Nanofluids; Micro/Nanoscale Interfacial Transport Phenomena; Micro/Nanoscale Boiling and Condensation Heat Transfer; Micro/Nanoscale Thermal Radiation; Micro/Nanoscale Energy Devices and Systems [V001T05A013] (ASME 2016 5th International Conference on Micro/Nanoscale Heat and Mass Transfer, MNHMT 2016; Vol. 1). American Society of Mechanical Engineers. https://doi.org/10.1115/MNHMT2016-6683